1/*
2 * Sonics Silicon Backplane
3 * PCI Hostdevice wrapper
4 *
5 * Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>
6 * Copyright (c) 2005 Stefano Brivio <st3@riseup.net>
7 * Copyright (c) 2005 Danny van Dyk <kugelfang@gentoo.org>
8 * Copyright (c) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch>
9 * Copyright (c) 2005-2007 Michael Buesch <m@bues.ch>
10 *
11 * Licensed under the GNU/GPL. See COPYING for details.
12 */
13
14#include <linux/pm.h>
15#include <linux/pci.h>
16#include <linux/export.h>
17#include <linux/slab.h>
18#include <linux/ssb/ssb.h>
19
20
21#ifdef CONFIG_PM_SLEEP
22static int ssb_pcihost_suspend(struct device *d)
23{
24	struct pci_dev *dev = to_pci_dev(d);
25	struct ssb_bus *ssb = pci_get_drvdata(dev);
26	int err;
27
28	err = ssb_bus_suspend(ssb);
29	if (err)
30		return err;
31	pci_save_state(dev);
32	pci_disable_device(dev);
33
34	/* if there is a wakeup enabled child device on ssb bus,
35	   enable pci wakeup posibility. */
36	device_set_wakeup_enable(d, d->power.wakeup_path);
37
38	pci_prepare_to_sleep(dev);
39
40	return 0;
41}
42
43static int ssb_pcihost_resume(struct device *d)
44{
45	struct pci_dev *dev = to_pci_dev(d);
46	struct ssb_bus *ssb = pci_get_drvdata(dev);
47	int err;
48
49	pci_back_from_sleep(dev);
50	err = pci_enable_device(dev);
51	if (err)
52		return err;
53	pci_restore_state(dev);
54	err = ssb_bus_resume(ssb);
55	if (err)
56		return err;
57
58	return 0;
59}
60
61static const struct dev_pm_ops ssb_pcihost_pm_ops = {
62	SET_SYSTEM_SLEEP_PM_OPS(ssb_pcihost_suspend, ssb_pcihost_resume)
63};
64
65#endif /* CONFIG_PM_SLEEP */
66
67static int ssb_pcihost_probe(struct pci_dev *dev,
68			     const struct pci_device_id *id)
69{
70	struct ssb_bus *ssb;
71	int err = -ENOMEM;
72	u32 val;
73
74	ssb = kzalloc(sizeof(*ssb), GFP_KERNEL);
75	if (!ssb)
76		goto out;
77	err = pci_enable_device(dev);
78	if (err)
79		goto err_kfree_ssb;
80	err = pci_request_regions(dev, dev_driver_string(&dev->dev));
81	if (err)
82		goto err_pci_disable;
83	pci_set_master(dev);
84
85	/* Disable the RETRY_TIMEOUT register (0x41) to keep
86	 * PCI Tx retries from interfering with C3 CPU state */
87	pci_read_config_dword(dev, 0x40, &val);
88	if ((val & 0x0000ff00) != 0)
89		pci_write_config_dword(dev, 0x40, val & 0xffff00ff);
90
91	err = ssb_bus_pcibus_register(ssb, dev);
92	if (err)
93		goto err_pci_release_regions;
94
95	pci_set_drvdata(dev, ssb);
96
97out:
98	return err;
99
100err_pci_release_regions:
101	pci_release_regions(dev);
102err_pci_disable:
103	pci_disable_device(dev);
104err_kfree_ssb:
105	kfree(ssb);
106	return err;
107}
108
109static void ssb_pcihost_remove(struct pci_dev *dev)
110{
111	struct ssb_bus *ssb = pci_get_drvdata(dev);
112
113	ssb_bus_unregister(ssb);
114	pci_release_regions(dev);
115	pci_disable_device(dev);
116	kfree(ssb);
117	pci_set_drvdata(dev, NULL);
118}
119
120int ssb_pcihost_register(struct pci_driver *driver)
121{
122	driver->probe = ssb_pcihost_probe;
123	driver->remove = ssb_pcihost_remove;
124#ifdef CONFIG_PM_SLEEP
125	driver->driver.pm = &ssb_pcihost_pm_ops;
126#endif
127
128	return pci_register_driver(driver);
129}
130EXPORT_SYMBOL(ssb_pcihost_register);
131